RFR: 8304928: Optimize ClassDesc.resolveConstantDesc

Fri Mar 31 02:27:06 UTC 2023

On Thu, 30 Mar 2023 20:06:02 GMT, Chen Liang <liach at openjdk.org> wrote:

> This patch optimizes ClassDesc.resolveConstantDesc for array classes. Otherwise, the performance of reference class resolution remain unchanged.
> 
> A benchmark comparing resolution for reference arrays, primitive arrays, and class or interfaces is included in this patch, and the result comparison on my machine is available at https://jmh.morethan.io/?gists=21c462f4879f6166b3308a41c092d51e,1aeae6ff40a129f89dbfedcb874cfd37

Done. Now the benchmark explicitly measures the 3 reference types, with new result in line with previous observations here: https://jmh.morethan.io/?gists=21c462f4879f6166b3308a41c092d51e,1aeae6ff40a129f89dbfedcb874cfd37

The `isPrimitiveArray` check is converted to a private method in `ReferenceClassDesc` as it applies only to reference type descriptor strings. Also included the rationale for not checking initial `[` in a comment.

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PR Comment: https://git.openjdk.org/jdk/pull/13252#issuecomment-1491196749